Apogee Instruments TS-120 Manual del usuario - Página 16
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Operation of the EE08 requires a voltage input of 7 to 30 V DC. Measurement of the output signals requires a
single-ended voltage measurement over a range of 0 to 2.5 V DC. A compatible measurement device should have
the capability to supply and measure these voltages.
The sensitivity of the air temperature sensor (voltage output from sensor per degree C) is 20.8 mV per C (reciprocal
of the slop listed in the OPERATION AND MEASUREMENT section). This means a voltage measurement resolution
of 2.08 mV is required to yield an air temperature measurement resolution of 0.1 C, and 0.208 mV is required to
yield an air temperature measurement resolution of 0.01 C. The sensitivity of the relative humidity sensor (voltage
output from sensor per % RH) is 25 mV per % (reciprocal of the slope listed in the OPERATION AND
MEASUREMENT section). This means a voltage measurement resolution of 2.5 mV is required to yield a relative
humidity measurement resolution of 0.1 % C, and 0.25 mV is required to yield a relative humidity measurement
resolution of 0.01 %.
An example datalogger program for Campbell Scientific dataloggers can be found on the Apogee webpage at:
https://www.apogeeinstruments.com/content/EplusE-EE08-Temp-RH-Probe.CR1
Effect of Cable Length & Modifying Cable Length
When the temperature sensor is connected to a measurement device with high input impedance, sensor output
signals are not changed by shortening the cable or splicing on additional cable in the field. Tests have shown that if
the input impedance of the measurements device is 1 mega-ohm or higher then there is negligible effect on the
sensors, even after adding up to 100 m of cable. TS-100 aspirated radiation shields use shielded, twisted pair cable,
which minimizes electromagnetic interference. This is particularly important for long lead lengths in
electromagnetically noisy environments.
Standard Apogee cable lengths for the EE08 are 5 m, 10 m, and 20 m. If a length greater than 20 m is required,
additional cable can be spliced onto a standard cable. For cable extensions, shielded, twisted-pair cable is
recommended, in order to minimize electromagnetic interference. This is particularly important for long lead
lengths in electromagnetically noisy environments. However, additional cable adds resistance and may influence
the accuracy of the measurement.
See Apogee webpage for details on how to extend sensor cable length
(http://www.apogeeinstruments.com/how-
to-make-a-weatherproof-cable-splice/).